下面是在HTML5中处理自定义错误消息的代码:

<input type="text" id="username" required placeholder="Enter Name" oninvalid = "。setCustomValidity('在这里输入用户名')" oninput = " this.setCustomValidity (")" / >

这部分很重要，因为它隐藏了用户输入新数据时的错误消息:

oninput="this.setCustomValidity('')"

解决方案防止谷歌Chrome错误消息输入每个符号:

<p>Click the 'Submit' button with empty input field and you will see the custom error message. Then put "-" sign in the same input field.</p> <form method="post" action="#"> <label for="text_number_1">Here you will see browser's error validation message on input:</label><br> <input id="test_number_1" type="number" min="0" required="true" oninput="this.setCustomValidity('')" oninvalid="this.setCustomValidity('This is my custom message.')"/> <input type="submit"/> </form> <form method="post" action="#"> <p></p> <label for="text_number_1">Here you will see no error messages on input:</label><br> <input id="test_number_2" type="number" min="0" required="true" oninput="(function(e){e.setCustomValidity(''); return !e.validity.valid && e.setCustomValidity(' ')})(this)" oninvalid="this.setCustomValidity('This is my custom message.')"/> <input type="submit"/> </form>

试试这个，它更好，而且经过测试:

function InvalidMsg(textbox) { if (textbox.value === '') { textbox.setCustomValidity('Required email address'); } else if (textbox.validity.typeMismatch){ textbox.setCustomValidity('please enter a valid email address'); } else { textbox.setCustomValidity(''); } return true; } <form id="myform"> <input id="email" oninvalid="InvalidMsg(this);" oninput="InvalidMsg(this);" name="email" type="email" required="required" /> <input type="submit" /> </form>

演示:

http://jsfiddle.net/patelriki13/Sqq8e/

在HTML5 event oninvalid的帮助下控制自定义消息是非常简单的

下面是代码:

<input id="UserID"  type="text" required="required"
       oninvalid="this.setCustomValidity('Witinnovation')"
       onvalid="this.setCustomValidity('')">

这是最重要的:

onvalid="this.setCustomValidity('')"

对于一个完整的自定义检查逻辑:

$(document).ready(function() { $('#form').on('submit', function(e) { if ($('#customCheck').val() != 'apple') { $('#customCheck')[0].setCustomValidity('Custom error here! "apple" is the magic word'); $('#customCheck')[0].reportValidity(); e.preventDefault(); } }); $('#customCheck').on('input', function() { $('#customCheck')[0].setCustomValidity(''); }); }); input { display: block; margin-top: 15px; } input[type="text"] { min-width: 250px; } <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> <form id="form"> <input type="text" placeholder="dafault check with 'required' TAG" required/> <input type="text" placeholder="custom check for word 'apple'" id="customCheck" /> <input type="submit"> </form>

使用setCustomValidity:

document.addEventListener("DOMContentLoaded", function() {
    var elements = document.getElementsByTagName("INPUT");
    for (var i = 0; i < elements.length; i++) {
        elements[i].oninvalid = function(e) {
            e.target.setCustomValidity("");
            if (!e.target.validity.valid) {
                e.target.setCustomValidity("This field cannot be left blank");
            }
        };
        elements[i].oninput = function(e) {
            e.target.setCustomValidity("");
        };
    }
})

根据评论中@itpastorn的建议，我把Mootools换成了普通的JavaScript，但如果有必要，你应该能够找到Mootools的等效版本。

Edit

我在这里更新了代码，因为setCustomValidity的工作方式与我最初回答时的理解略有不同。如果setCustomValidity被设置为空字符串以外的任何值，将导致该字段被认为无效;因此，您必须在测试有效性之前清除它，您不能只是设置它然后忘记。

进一步的编辑

正如下面@thomasvdb的评论中指出的那样，你需要在无效之外的一些事件中清除自定义有效性，否则可能会通过oninvalid处理程序来清除它。